I've got the rev limiter set at 6K RPM .... its hard to believe but she is slightly start to lay down on just before I bump the rev limiter. I think all that velocity plays a role into it.
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 2,000-6,000
Intake Duration at 050 inch Lift 238
Exhaust Duration at 050 inch Lift 238
Duration at 050 inch Lift 238 int./238 exh.
Advertised Intake Duration 280
Advertised Exhaust Duration 280
Advertised Duration 280 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.474 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.474 in.
Valve Lift with Factory Rocker Arm Ratio 0.474 int./0.474 exh.
Lobe Separation (degrees) 110
BJR did something on the valve job as well not that you mention valves... but gosh I can't remember what.... 4 or 5 angle valve job I think it was??